[PSUBS-MAILIST] Motor Question

[James Frankland via Personal_Submersibles]

Hi Sean
Yes, thats exactly what I mean.  However, thats on my K350. I have learnt
to live with the difficulty of dismantling the motors and try to do so as
little as possible.

I was just asking if anyone has any experience with different types that
dont have this issue, so I can avoid it on my new boat..  There are loads
of different ones available on amazon of all sorts of makes and prices.

I have been looking at the ones with the brushed at the other end.  As hank
mentions in the next email.

Thanks again
James

On Tue, 21 Nov 2023 at 17:37, Sean T. Stevenson via Personal_Submersibles <
personal_submersibles at psubs.org> wrote:

> James, if I understand correctly, your cable exit is potted and cannot be
> modified, and so you are having to connect your motor leads to the inside
> end of the potted electrodes, and then you insert your motor axially while
> having to accommodate the consequent slack in the motor leads. Do I
> understand this correctly?
>
> Short of drilling out the potting and re-terminating, I might address this
> by attempting to eliminate the flexible leads entirely. Would it be
> possible to install some sort of bus bar arrangement in the known radial
> clearance gap, connected to the potted leads, and then with a mechanically
> sliding connection on the motor side? (Or vise versa if you have fixed
> electrode positions at the penetrator)?
>
> If such a fixed arrangement isn't possible, my next thought is to pair the
> motor leads with a stiffening element that might simulate an energy chain
> in a larger system, whereby a plastic or wire element is bent into a loop
> and provides physical support to the current carrying conductors in order
> to keep them clear of the armature.
>
> Sean
> -------- Original Message --------
> On Nov. 21, 2023, 09:55, James Frankland via Personal_Submersibles <
> personal_submersibles at psubs.org> wrote:
>
>
> Hi All
>
> Anyone got any suggestions for this?
>
> I am thinking about what motors to get for my new boat.  I designed it up
> using dimensions from my existing Minn Kota 80's.
>
> On Jodie B I have 3 of these which totals 240lb thrust. which is more than
> i need really.  I can run on just the rear for surface driving.
>
> On the new boat i will have 4 motors.
>
> Im thinking of smaller ones.  Something along the lines of 4 x 40-50lb
> would probably be ok.
>
> The biggest thing I want to try and avoid is the difficulty of the wire
> location that i have on the Minn Kota 80's.  The location is ok if the
> cable runs up the shaft as intended in the standard motor design as you can
> pull them tight and clear, but once I potted the replacement shaft, the
> cables then become very troublesome to keep out of the way of the
> armature\commutator\brush assembly.
>
> Some other people have experienced this as we have discussed it before.
>
> Rubbish drawing attached.  You can see the blue part is the potted
> connections which make the wires onto the brushes really tricky.
>
> [image: image.png]
>
> Does anyone know of a motor that would be easier to modify or where the
> shaft hole is in a more convenient place?
>
> Any suggestions?
> Kind Regards
> James
>
>
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>
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